mine-transcripts

name	mine-transcripts
description	Mine past Claude Code session transcripts (JSONL) to extract user corrections, successful patterns, and recurring failure modes. Proposes diffs against lessons.md and rules/*.md for human review. Triggers on /mine-transcripts, "mine my sessions", "what did I learn this week", "session retro". Use weekly or after a fleet completes.
when_to_use	Weekly retro. After a fleet completes. When you suspect a pattern of mistakes. When CLAUDE.md feels stale.
allowed-tools	Bash, Read, Write, Edit, Glob, Grep
arguments	["since"]

/mine-transcripts — Turn past sessions into rule patches

/mine-transcripts [since] reads recent session JSONL files, extracts learnings, and proposes diffs.

Defaults

• since defaults to 7d (last 7 days)
• Other values: 24h, 30d, or an ISO date

What you produce

1. A scratch report at ~/.claude/telemetry/mining-runs/<timestamp>.md listing:

   • Sessions processed (count, total tokens, total wall time)
   • Corrections found (places where user redirected the agent)
   • Patterns found (workflows that succeeded notably)
   • Failure modes found (mistakes that recurred ≥2 times)

2. Proposed patches for human review:

   • ~/.claude/telemetry/mining-runs/<timestamp>/lessons.diff — proposed additions to lessons.md
   • ~/.claude/telemetry/mining-runs/<timestamp>/rules-<name>.diff — proposed additions to specific rules
   • ~/.claude/telemetry/mining-runs/<timestamp>/agent-tuning.md — agents that should be tuned (recurring failures)

3. A short summary to stdout: "5 corrections, 2 patterns, 3 failure modes. Diffs at . Apply with /apply-mining-patches."

How you do it

Step 1: Find sessions

# Sessions live at ~/.claude/projects/<project-dir>/<uuid>.jsonl
SINCE_TS=$(date -d "$since ago" +%s 2>/dev/null || date -v-${since} +%s)
find ~/.claude/projects -name "*.jsonl" -newer <(date -d "@$SINCE_TS") 2>/dev/null

Filter:

• Skip files <2KB (test/empty)
• Skip files in agent-*.jsonl form (subagent sidechains — extract with their parent, not separately)

Step 2: Pre-filter for signal

Parsing every event is expensive. Pre-filter for events that contain learning signal:

• user messages that come right after an assistant message (likely corrections)
• Tool errors (failure modes)
• Long assistant messages right before user "no" / "stop" / "wait" (interruptions)

A 100MB transcript usually compresses to ~5% interesting events.

Step 3: Mine with Haiku

For each filtered chunk, invoke claude -p with --model claude-haiku-4-5-20251001 and the extraction prompt:

claude --bare -p "$(cat ~/.claude/skills/mine-transcripts/extract-prompt.md)" \
  --model claude-haiku-4-5-20251001 \
  --output-format json \
  --json-schema "$(cat ~/.claude/skills/mine-transcripts/output.schema.json)" \
  --max-turns 1 \
  < "$chunk"

The schema-enforced output gives structured records.

Step 4: Cluster and dedupe

• Cluster corrections by topic (use Haiku again with a clustering prompt, or simple keyword-based grouping)
• Drop duplicates (same lesson learned twice in two sessions becomes one entry)
• Tag each finding with its source session ID for traceability

Step 5: Generate diffs

Write proposed additions to lessons.md and rules/*.md as unified diffs (not direct edits — human reviews first).

Each lesson entry MUST follow the format from ~/.claude/CLAUDE.md user/feedback memory style:

## <date> — <title>

<rule statement>

**Why:** <reason / incident reference>
**How to apply:** <when this kicks in>
**Source:** session=<id>, turn=<n>

Step 6: Surface to user

Print summary, list output paths. Tell the user how to apply: review the diffs, then either git apply or copy-paste, or invoke /apply-mining-patches <run-timestamp> (a follow-up skill that does the apply for you).

Cost discipline

A 7-day mining run on a heavy user can cost $0.50–$2.00 with Haiku. Hard limits:

• Max 200 sessions per run
• Max 50K tokens per session (truncate longer)
• Skip sessions already mined (track in ~/.claude/telemetry/mining-runs/.processed.jsonl)

If projected cost exceeds $5, stop and ask the user.

When NOT to mine

• During an active fleet (you'll mine your own in-progress session)
• Right after a major CLAUDE.md edit (mining will pick up the edit-related noise)
• When ~/.claude/telemetry/mining-runs/.processed.jsonl shows the same sessions were mined <24h ago